Super tight garbage mattes

Using a basic After Effects color key like Color Range then applies the Simple Choker filter with a negative setting, expanding the matte to let an advanced keyer like Keylight to work more subtle magic.

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Difference Matte Effect Tutorial

The Difference Matte effect creates a transparency a mask or a matte by comparing the pixels in a source layer with the pixel in a defined difference layer, and then keying out (eliminating) pixels in the source layer that match both the position and color in the difference layer.